Fluid conditioner for cooling fluid in a tank holding computers and/or other electronics equipment, a cooling system incorporating such a fluid conditioner, and a method of cooling fluid in a tank holding computers and/or other electronics equipment

A fluid conditioner 1 for use in a tank 110 containing electronic devices, immersed in fluid F, comprises a housing 10 having a chamber 38, an outlet 14, a heat exchanger 18 located in the chamber, and one or more pumps 16 such that the fluid passes into contact with the heat exchanger. The heat exchanger 18 has an inlet 30 for cooling medium to enter and an outlet 32 for cooling medium to exit. In the upright, operational orientation, the pumps 16 and the heat exchanger 18 are vertically spaced relative to one another and the heat exchanger 18 is located above the outlet. Fluid F is moved through the pumps 16 and passes into contact with the heat exchanger 18. The cooled fluid F exits via the outlet 14 of the fluid conditioner 1 and passes into the lower region of the tank 110 for circulation therethrough.